My understanding is the dist housing hits the head..
not the vac pot so indexing wouldnt change it.. most
of the guys clearance the head or go with the off set
dist
EDIT
Also Dave.. have your valve covers on also to
make sure they clear.. I heard some had to re-
work that corner of the covers... when I mocked
up my mega block with B1 m/c heads the dist was
hitting.. I didnt have V/Cs at that time but I
think they would have crashed.. thats why I was
looking at the off set dist